Valve guide and unseater



Much 1934- N. F. MONAUGHT ET AL 1,952,087

VALVE GUIDE AND UNSEAI'ER Filed Nov. 9. 1931 Patented Mar. 27, 19341,952,087

' muss-m s FATE? or-Fica 1,952,087 v vALvE GUIDE AND UNSEATER Norris F.McNaught and Edward H. Peterson, Chicago, 111., assignors to Duro MetalProducts 1 Company, Chicago, 111., a corporation oi Illinois ApplicationNovember 9, 1931, Serial No. 573,81?

5 Claims. (o1. 51-2e2) Our invention "relates to a ,valve guide andternal shoulder 15 which bears against the adjaunseater,particularlyadapted for grinding the cent portion of the block 6. Theshoulders '16 valves of internal "combustion engines having re=-together provide an annular shoulder which con-'- movable valve stemguides. stitutes an abutment for the upper end of. the 5 .In'the wellknown Ford engine, as now conspring 12. 6 structed, the 'stemsxof thevalves are provided It has been extremely difficult to grind valves withintegral lower ends of greater diameter of the kind above mentionedbecause removal-of than are the portions of the stems which are thespring 12, which holds the separable and reembraced by the valve :stemguides. Inorder movable guide sections 13 and 14 in position, renthatthe stems and guides may be assembled in ders the latter unavailable foruse in the valve operative relationship, the guides are formed ingrinding operation. removable sections, necessarily removable with Thedevice of our present invention, shown in the valves, and held inpositionv by the springs Figs. 1 to 4 inclusive; comprises a pair ofcomwhich urge the valves-to their seats. plementary hinged metal members17 and 18,

It has been found very difiicult to grind the each comprising asemi-cylindrical stem guide valves of engines having the aforesaidstructural portion 19 merging at a shoulder 20 into a headpeculiarities. Firstly, the sectional valve guides of portion 21. Thehead portions 21, 21 are hinged the engine are not available for usewhen the together by pivot pin rivets 22, 22, which extend valve springswhich hold the valve guide secthrough the cooperating hinge ears 22a,22a which 20 tions in position" are removed. .Secondly, there are formedon the said head portions 21, 21. as has been a lack of satisfactoryabutments for the shown. Each of the head portions 21, 21 also isunseating springs which are used during the valve provided with a pairof stop lugs 23, 23 which grinding operation. 7 are adapted to engagethe corresponding lugs of In the accompanying. drawing illustrating athe other head portion to prevent separation of 25 preferred embodimentofour invention, the stem guide portions 19, 19 to a greater de- Fig.1*is a sideelevational view ofthe device gree than is illustrated inFig. 2. of the present invention; The stem guide portions 19, 19 of thehinged Fig. 2 is aside elevational view of the same members 17 and 18are provided with machined illustrating the device in open position;complementary semi-cylindrical grooves 24, 24 Fig; '3' is a horizontalsectional view taken on adapted snugly to embrace the stem 9 of the en-85 theline 3-3 of Fig. 1; gine valve'as shown in Fig. 4; The headportions Fig. 4 is a vertical sectional view showing the 21, 21 of themembers 1'? and 18 are provided with device of the present invention asit appears ready relatively large complementary and opposed refor use ina valve grindingoperation; and cesses 25, 25 through which the enlargedlower Fig. 5 is a vertical sectional view of the block, extremity 10 ofthe valve may be passed down- 9 valve, sectional valve stem guides,valve spring, wardly when the members 17 and 18 are in their etcI of anengine of:the kind with which the deopen positions as shown in Fig. 2.vice of our invention primarily is intended to be The head portions 21,21 of the hinged memused. I bers 1'7 and 18 are provided withdiametrically op- Similar characters of reference refer to similarpcsite apertured cars 26, 26, the apertures of the parts throughout theseveral views. ears being so located that the line between themReferring first to Fig. 5, at 6 we have illuslies above the common axisof the pivots 22, 22 waited a portion of an engine block provided withwhen the members 17 and 18 are separated as a seat 7 with which a poppetvalve cooperates. shown in Fig. 2; the line between said apertures '45The valve comprises a hub 8 and a stem 9, the falling below the saidaxis when the hinged memstem having an enlarged integral lowerextremibers are closed together as shown in Fig. 1.

tyflO which is irusto-conical in shape. At 11 we At 2'7 we have shown acoil spring, the lower have shown the U-shaped washer whichemconvolutions of which embrace the head portions I braces and bearsagainst the enlarged stem por- 21, 21 of the hinged members 17 and 18,the lowtion 10 and constitutes an abutment for the lowermost convolutionof the spring extending or end of the valve spring 12. The valve stemthrough the apertures of both of the lugs 26, 26 guide consists of twocomplementary separable as shown, and being provided with an offsetendand removable sections 13 and 14 received within 28. Head portion 21 ofmember 18 1s rov1ded the guide bore 15 of the engine block. Each with anoutwardly extending pin 29 which limits guide section is provided withasemi-circular exmovement of the spring extremity 28 to that 10 shortdistance between said pin 29 and the adjacent ear 26.

By reason of the arrangement shown, the pressure of the lowermostconvolution of the spring 27 against the head portions 21, 21 of thehinged members 17 and 18 tends to hold the latter in their openpositions when opened and in their closedpositions when closed. Thischaracteristic of the device of our invention facilitates itsapplication to the valve and also facilitates its insertion into theengine valve stem bore 15. Further to facilitate the insertion of thestem guide portions 19, 19 into the engine stem guide bore, the lowerends of the said stem guide portions 19, 19 preferably are externallybeveled, as indicated at 30, 30.

In using the device of our invention (the valve, valve spring andsectional valve stem guide being removed from the engine block) it isopened as shown in Fig. 2, and the enlarged lower extremity of the valvestem is passed downwardly throughthe spring 27 and the recesses 25, 25of the head portions 21, 21. The device then is closed upon the valvestem and the stem guide sections 19, 19 are inserted into the stem guidebore 15 of the engine, as is shown in Fig. 4. In thissituation, thespring 27 acts as an unseating spring tending to hold the valve slightlyoff of its seat. Grinding of the valve then proceeds in a well knownmanner.

Having thus illustrated and described a preferred embodiment of ourinvention, what we claim is new and desire to secure by Letters Patentof the United States is:

1. In a device of the class described, a pair of valve stem embracingmembers, said members comprising guide portions having opposedsemicylindrical grooves and head portions having opposed grooves largerthan those of the guide portions, means pivotally connecting saidmembets on a transverse axis at their head portions and a coiledunseating spring carried by and projecting upwardly from the headportions of said members, the lowermost convolution of said springembracing said head portions and being attached to the latter at pointswhich lie below their pivotal axis when the unpivoted lower portions ofsaid members lie in engagement with each other.

2. In a device of the class described, a pair of valve stem embracingmembers, said members comprising guide portions having opposedsemicylindrical grooves and head portions having opposed grooves largerthan those of the guide portions, means pivotally connecting saidmembers on a transverse axis at their head portions and a coiledunseating spring carried by and projecting upwardly from the headportions of said members, the lowermost convolution of said springembracing said head portions and being attached to the latter at pointswhich are adapted to lie above their pivotal axis when the lowerportions of said members are swung apart and which lie below said axiswhen said lower portions engage each other, whereby said spring tends tohold said members in the closed rela tionship when closed and in theopen relationship when opened.

3. A device of the class described comprising a pair of substantiallysymmetrical valve stem guide members shaped for insertion into the valvestem guide bore of an engine and provided at their lower portions withopposed semi-cylindrical grooves adapted to embrace the cylindricalportion of a valve stem, said members being pivoted together at theirupper ends and having the opposed surfaces of their upper portionsconformed to pass a valve stem extremity of greater diameter than thepassage defined by the opposed semi-cylindrical grooves of the saidlower portions, together with an unseating spring carried by andextending upwardly from said members and so related to their pivotalaxis as to hold them i'nthe closed relationship when closed and in theopen relationship when opened.

4. A device of the class described comprising a pair of substantiallysymmetrical valve stem guide members shaped for insertion into the valvestem guide bore of an engine and provided at their lower portions withopposedsemi-cylindrical grooves adapted to embrace the cylindricalportion of a valve stem, said members being pivoted together on atransverse axis at their upper ends and having the opposed surfaces oftheir upper portions conformed to pass a valve stem extremity of greaterdiameter than the passage defined by the opposed' semi-cylindricalgrooves of the said lower portions, together with an unseating springcarried by and extending upwardly from said members and adaptedyieldingly to hold them closed on each other when in that relationship.

5. A device of the class described comprising a pair of substantiallysymmetrical valve stem guide members shaped for insertion into the valvestem guide bore of an engine and provided at their lower portions withopposed semi-cylindrical grooves adapted to embrace the cylindricalportion of a valve stem, said members being pivoted together on atransverse axis at their upper ends and having the opposed surfaces oftheir upper portions conformed to pass a valve stem extremity of greaterdiameter than the passage defined by the opposed semi-cylindricalgrooves of the said lower portions, together with an unseating springcarried by and extending upwardly from said members and so related totheir pivotal axis as to hold them in the closed rela tionship whenclosed and in the open relationship when opened.

NORRIS F. MCNAUGHT. EDWARD H. PETERSON.

